I'd actually guess it was just a copy-paste of the "sqlite over webworker using wasm" demo, backed by the actual sqlite of the actions https://www.awsiam.info/iam.db
It's using react-table to drive the table functionality but under the hood it's just a SQlite database hooked up with sql.js-httpvfs.
My go to for this kind of all-in-one IAM reference is https://github.com/widdix/complete-aws-iam-reference -> https://iam.cloudonaut.io/ although I guess they stopped paying attention to the issues and PRs in light of their new "use the AWS docs" banner
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Toward that end, I have *long* wanted to be able to rebuild the AWS docs locally, to fix some rendering pet peeves of mine, and it became a raging fire recently when they stopped making the PDF of cfn-ug (https://docs.aws.amazon.com/cloudformation/), so if someone has some local tooling for that, I (and others: https://github.com/awsdocs/amazon-ec2-user-guide/issues/101) would value knowing about it
The data is updated on a weekly cron. I run a small python script that utilizes Parliament's code for downloading the docs pages and parsing them into json. From there, what I did was create a SQL schema with SQLAlchemy and load the json data from the Parliament script.
I open sourced the code for anyone curious, it's nothing fancy. https://github.com/zscholl/aws-iam-db
I'd seen the cloudonaut site but I kept going back to the AWS docs to answer questions like: "what are all the s3 write actions?" or "what am I actually allowing with S3:get*?"
I created this to help solve that problem without googling "aws iam s3 actions" and scrolling down through AWS' pages.